dt-bindings: display: st7701: Add Winstar wf40eswaa6mnn0 panel

The Winstar wf40eswaa6mnn0 panel is a square 4.0" TFT LCD with a
resolution of 480x480 pixels.

Signed-off-by: Stefan Eichenberger <[email protected]>
Acked-by: Conor Dooley <[email protected]>
Signed-off-by: Neil Armstrong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: eichenberger

Documentation/devicetree/bindings/display/panel/sitronix,st7701.yaml

@@ -29,6 +29,7 @@ properties:
           - densitron,dmt028vghmcmi-1a
           - elida,kd50t048a
           - techstar,ts8550b
+          - winstar,wf40eswaa6mnn0
       - const: sitronix,st7701
 
   reg: